The correct option is C Pleasure of the Legislative Assembly
On the advice of the Chief Minister, the Governor can dismiss a minister but he cannot dismiss the ministry collectively. The words "during the pleasure of the Governor" in reality mean the pleasure of the legislative assembly. The right to expel the ministry collectively belongs to the assembly and not to the Governor. However, in all cases of dismissal of the Chief Minister, a minister or the entire ministry, the decision of the Governor is final and cannot be challenged in any court of law.